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Repurchase Agreements Accounted for as Secured Borrowings (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Collateralized Mortgage Backed Securities | Maturity Overnight | FHLB Advances and Other Borrowings    
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]    
Repurchased agreements $ 33,870 $ 45,274